CVE-2019-0982 Denial of service in ASP.NET Core

What is CVE-2019-0982?

CVE-2019-0982 is a high-severity denial of service vulnerability in Microsoft ASP.NET Core, published on 16 May 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A denial of service vulnerability exists when ASP.NET Core improperly handles web requests, aka 'ASP.NET Core Denial of Service Vulnerability'.

Weakness: CWE-19

Which versions are affected by CVE-2019-0982?

4 open source packages ship an affected version, including Microsoft.AspNetCore.SignalR.Protocols.MessagePack. It affects 1 product.

Products include Microsoft Asp.net Core.

How do I fix CVE-2019-0982?

Upgrade Microsoft.AspNetCore.SignalR.Protocols.MessagePack to a fixed version for your release line: 1.0.11 or 1.1.5.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2019-0982 being exploited?

There is no known exploitation of CVE-2019-0982 in the wild and no public exploit code.

Other vulnerabilities in Microsoft ASP.NET Core

• CVE-2025-55315 ASP.NET Security Feature Bypass Vulnerability Critical 9.9
• CVE-2026-88092 ASP.NET Core Tampering Vulnerability Critical 9.4
• CVE-2026-40372 ASP.NET Core Elevation of Privilege Vulnerability Critical 9.1
• CVE-2021-43877 ASP.NET Core and Visual Studio Elevation of Privilege Vulnerability High 8.8
• CVE-2020-0603 Remote code execution in ASP.NET Core High 8.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-4jxx-4qxw-prxm.